Electric-arc lamp.



'1", semen. ELECTRIC ARC LAMP. APPLICATION FILED A1313. 19 07.

Patented y 6, 1909 4 sums-sum 1 i im fii INVENTOR: moms JPf/YChf;

T. SPENCER.

ELECTRIC ARC LAMP.

APPLICATION FILED APR.3, 1907.

mama July 1909 4 SHEETS-SHEET 2.

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g 15 A g7 5 l I I T. SPENCER. ELECTRIC ARG LAMP. APPLICATION PILIID APR. 3. 1907.

Patented July 6 4 SHEETS-BHEET 3.

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iNVENTQR. \7 moms J/FAWCEIE WITN ESSES T. SPEEIGERH ELECTRIC ARC LAMP.

APPLICATION TILED APR. 3. 1907.

Patentefi July 6 1909.

4 BHBETS-SHBET 4 wwmzssas= V. 59 mvENmR; gammy afifmwa carbon, so that the movement of both car- 1 II, in the direction of the arrows marked on Figs. I, III and IV.

THOMASSIENCER, OF PHILADELPHIA. P NNSYLVANIA.

ELECTRIC-ARC LAMP.

Specification ofiietters Patent.

Patented July 6, 1909.

Application filed April 3, 1907. Serial No. 366,206.

To all whom it may concern: j

Be it known that I, 'lnonas Spnxcnn, of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvenient in Electric-Arc Lamps, wl'icrcol the following is a specification, reference bein had to the accompanying drawings 31y invention relates to lamps of'the class wherein the arc is formed between the. lower ends of two carbons which both point down- I wardly, and may be employed with particular advantage with carbons containing metal-.. lic salts, and characterized as flaming arc carbons.

It is an object ofmy invention to provide 1 such a lamp with simple and ellicicnt means for contemporaneously controlling the'fce-ding movement of the carbons; springing the are between them, and prcvcnting excessive flaming of the are by restricting the movement of the latter. I

As hereinafter described, my invention comprises a lamp wherein the feeding movementof one of the carbons isdetci-mined by its lower end resting upon a stop with respec-t to which it moves only as it is consinned, and, did holder of said carbon is connected by a yoke with the holder of the other bons is controlled by said stop which encounters, but one of them. Said carbon which encounters the stationary stop is provided with a guide maintaining it in invariable angular relation witlrthelamp frame, but the other carbon is capable of lateral oscillatoi v.mnvement toward and away from the controlling carbon to spring the arc; the oscillatory movement of said carbon being eil'ectcd by a pivoted guide engaging its lower cod and operatively connected by a rod with thomovable core of a magnet coil.

As hereinafter described, the flaming of the arc is regulated and limited by two blow magnets and a magnetic bridge which short circuits the field of saidmagnets, so that said iicldis weaker nearer the normal location of the arc than in the re ion'above the same.

My invention comprises the various novel features of construction and arrangement hereinafter specified In'the drawingsfl igure I, is aside elevaa n of a lamp conveniently embodying my improvements. .Fig. II, is a vertical sec-.; tionai view of said lamp, taken on the line i Fig. III, is an in I Figs. I and I l.

, pairs of rollers 21, and

verted plan sectional View, taken on the line III, III, in Figsol and II. Fi IV, is a plan sectional view, taken on the line IV, IV, in I Fig. V, is an enlarged-vertical fragmentary sectional view of the arc striking mechanism shown in Fig. II, taken on the 7 same plane as th latter, indicated by the line V, V, in Fig. VI.

Fig. VI, is a vertical sectional view of said arostriking mechanism, taken on the line VI, VI, in the direction of the arrows shown in Fig. V. Fig. VII, a fragmentary sectional view, taken on the line VII, VII, in Fi IV. Fig. VIII, is a plan view of the insu sting bushing shown in section in Fig. VII. Fig. IX, is a rspective view of the magnetic bridge s own in section in Fig. VII. Fig. X, is a plan view of the carbon holder shown in Fig. I. Fig. XI. is a fragmentary sectional view similar to Fig. V, but showing a modified construe tion. I In said drawings; the lamp frame comprises the cap 1, provided with the supporting loop 2, connected therewith by the cotter pin 3, extending through the insulator 4, and standards 5, on said cap. Said cap comprises four hangers 6, .with which the frame I plate 7, is rigidly connected by the screws 8, extending through the flanges 9, on the vertical webs 10, as shown in Fig. III. Said frame plate 7, is rigidly connected with the frame ring 11, at the bottom of the lamp, by the four rods disposed in two pairs 12, and

' 13, upon respectively opposite sides of, the

lamp and downwardly converged toward the central axis of the lamp, as shown in II. As shown in Fig. 1,-the rods of the respective pairs are. parallel with each other, and the carbon holders 15, and 16, are mounted to slide on said rods between them.

Said holders 15, and 16, are cross connected opposite arms 19, which extend between I in the respective holders, so that movement of one of said holders efi'ects corresponding movement of the other holder, althou h they are permitted to approach and reced e with respect to each other, in accordance with their osition, on said frame rods 12, and 13. Sai rollers 21, and 22, are carried by res ective bearings 24, and 25, which are loose y fitted to said rods 12, and .13, and lugs 26, and 27, which wax u on said rods, so that said holders are capab e of slight oscillatory movement thereon. Said carbon rovided with pivot but insulated therefrom holders 15, and 16, respectively comprise car bon sockets 30', and 31, which are split as indicated in Figs. 1 and Il, so as to resiliently engage the upper ends of the respective earbons 32, and 33. 1t may be observed that said carbons are of respectively different diameters, the positive carbon 33, bemg larger than the negative carbon 32, and the pro ortion between the diameters of said car one being such that they are respectively consumed at the same rate, in the arc gap 34, between their lower ends, When fed toward each other at the same rate.

The negative carbon 32, is provided with the stationary guide 35, secured in rigid relation with the frame ring 1 l, by the screws 36, by the mica 37. Said guide 35, cooperates with the rods 12, to maintain the carbon 32, in invariable angular relation with the central axis of the lamp,

and determines its path otmovement with respect to the stop 39, upon which it rests as shown in Fig. 11. Said stop 39, being subjectcd to erosion by the action of the are at said gap 34, is made a rotary disk so that its region of contact with the carbon 32, can be maintained substantially constant in relation to the path to which said carbon is limited by the guide35. Said disk 39, is refer ably copper and mounted on the stu shaft 1 40, so t lat it may be turned by hand, by the lamp trimmer, to present a fresh surface for contact with the carbon 32, as required.

The cotter pin 41, and washer 42, detachably retain said disk 39, on, the shaft 40, and, the latter is carried by the bracket 45, which 1s maintained in rigid relation with the frame ring 11, by the screws 46, but is insulated from said ring 11, by the bushings 47. Said positive carbon 33, being free to oscillate to a imited extent upon the pivot lu s 27, in. the holder 16, may be automatically brought into contact at its lower end with the carbon 32, or be separated from the latter as shown in Fig. ll, so as to spring an are between said carbons, as follows :-Said carbon 33, extends through the. guide 50, which is carried by the lever 51, but insulated therefrom by the bushing 52. Said lever 51, is pivoted at 53, in the bifurcated end 54, of the rod'55, which is mounted for free vertical reciprocation in the tubular column 57, which latter forms a rigid part-of the lamp frame, being secured at its upper end in the frame plate 7, as shown in Fig. ll. Said lever 51, is provided with a projection 59, which engagesthe stationary abutment 60, formed by the ed es'of a recess in. said column 57, as shown in ig. V, or, by a screw stud 61, as shown in Fig. XI; Said rod 55, carries the solenoid core 62, which is connected therewith by the pin 63, entered loosely through the slot 64, in said rod, as shown in Figs. V, and VI. Said rod 55, also carries at its upper end the dash pot plunger 65, formed of graphite, secured by-the nut 66,

which is held in place by the sleeve 73, of non- 'magnetizablc metal, which, with the annulu r disks 74, of rnaguctisable metal forms a spool for the solenoid coil 75. Said spool is rigidly secured on the frame plate 7, by the screws 5 76, shown in Fig. lib-so that said coil 75, encircles the solenoid core 62, in operative rcla tion'therewith, as shown in Fig. 11. It is to be understood that when the lamp is energized, said core 62, is raised by the magnetism of said coil 75, to the position shown in Fig. 11; the speed of its up ward movement being limited by the escape of air between said plunger 65, and the dash pot 71. Such movement'of the core 62, raises the rod 55,

n \Jltll! dash pct 71. is carried by the flanged ring 72, v

and the lever 51, so that the latter is tilted to the'position shown in'Fig. ll, by contact of its rejection 59, with the abutment 60. Sucli tilting movement of the lever 51, may be variably limited by the set screw 76, shown in FigsfV, and Y1, having a conica point which encounters" the adjacent edge of said lever 51 it being understood that the extent of the tilting moveuu-nt may be increased by withdrawing said screw 79, or decreased by inserting it. 75, is connected in series with the resistance coils 77, and 73, which as shown in Fig. ll, are Wound upon spirally rooved porcelain bobbins 80, sup )orted by t 1e rods 81, which are dctachably held, by the'nuts 82, in the cross bars 83, which, as shown in Fig. III, are

detachably secured in rigid relation with the webs 10, of the frame plate 7 by the screws 84. Said carbons 32, and 33, extend through respective openings 85, and 86, in the m celain bushing 87, shown in Fig. Vlll, w rich is encircled by the magnetic bridge 88, shown in perspective in Fig. IX. Said brid e is convemently formed of. a punched strip of Said solenoid coil sheet iron, and retained between the brass frame ring 11,-and the porcelainbushing 87, by the screws 90, shown in Fig. 1, which are entered through the apertures 91, in said bridge, and im 1nge upon said bushing 87, so as to detacha ly retain the latter.- When thus secured, the recesses 92, in the edges of said bridge are adjacent to thev cores 95, of the blow magnet coils 96, which are located upon opposite sides of the spark ga 34, between the carbons 32, and 33, as s own in Fig. IV. Said cores 95, being rigidly mounted in lugs 97, in said ring 11, as shown in Fig. VII, are thus separated from said bridge.

The effect of said magnetic bridge eaaoie 'speot to said coils, said clamps being secured in adgustod position, by the screws 100, and

nuts 101 ;.the latter being prevented from rotating byjzhe bent ends 102, of said clamps to which the leads are secured by screws 103.

The electric circuit through the lamp ineludes all of the coils in, series relation with ealch other and the are, as follows: The exte rior positive lead 105, is detachably connected with the terminal 106, from which the lead 108, extends to thc'clam ring 99, on the coil 78, Whose end 109, is cetachably connected by the nut 110, with the rod 111, which is rigidly mounted in the frame plate 7, but insulated therefrom. The flexible connector 113, extends from the binder 114, at the lower end of said rod 111, to the positive carbon holder 16, to which it is detachably secured by the binder 115. The circuit thus includes the carbon 33, are ap 34, car bon 32, carbon holder 15. The exible connector 117, extends from the binder 118, on said carbon'holder 15, to theibinder 119, at the lower end of the rod 120, which latter is ri i'dly secured at its upper end in the frame p ate 7, but insulated therefrom. The lead 121, extends from said binder 119, to one of the blow maq'net coils 96, which is connected in series Wit the other coil 96, by the lead 123. he lead 124, extends from the last coil 96, to the binder 125, on the end 126, of the resistance coil 77 The clamp 98, on said coil 77, isconnectcd by the lead 128, with the binder 129, onthc end 130, of the solenoid coil 75. The opposite end 131, of said coil '75, has the binder 132, connected by the load 134, With the binder 135, on the switch lever 137, which is insulated from, but rigidly connected with, the shaft 138, having the handle 140; whereby said [over 137, may be turned into contact with or away from the negative terminal 121, which is detachably connected with the exterior negative lead 141.

t is to be understood thatl do not desire to limit 'myseli' to theprccise details of construction andarrangemem. herein described, as various modifications may be made therein, without departing from the essential feation twining one of said holders in invariable angular relation with said frame; means arranged to vary the angular relation of the other of said holders, by oscillation of the latter com rising a vertic'allreciprocatory rod and a everpivoted at tllc lower end of said rod and engagingv the oscillatory carbon a stationary abutment arranged to tilt said lever; means carried by said rod, arranged to limit the movement of said lever; a magnet core carried by said rod; and, a magnet coil encircling said core in operative relation therewith, substantially as set forth.

2. in an electric arc lamp, the combination with a frame; of holders arranged to pre sent two carbons in oblique relation to the vertical axis of said frame; means maintaining one of said holders in invariableangular relation with saic frame; means arranged to vary the angular relation of the other of'said holders, by oscillation 01' the latter, comprising a vertically reciprocatory coil encircling said core in operative relation therewith; a dash pot above said magnet; and, a. plunger connected with said rod in operative relation with said dash pot, sub-- stantially as set forth.

3. In an electric arc lamp, the c0mloinaith a frame; of holders arranged to present two carbons inoblique relation to the vertical axis of said frame; means maintaining one of said holders in invariable angular relation with said frame; means arran'gwl to var 1 the angular relation of the other of said iolders, by oscillation of the latter, comprising a vertically rcciprocatorprod and a lever pivoted at the lower end of said rod engaging the oscillatory carbon; an abutment arranged to tilt said lever; an abptment carried by said rod arranged to limit themovcment of said lever; moans arranged to ad ust said abutment to vary the moverod and a lever pivoted at the lower end of ment' of said lever; and, means arranged to shift said rod, substantially as set forth;

4. In an electric arc lamp, the combination with parallel guide rods; ofa carbon. holder arranged to slide upon said rods be tween them, comprising bearin s respec tively engaging said rods; a tubu or carbon sooliet; and, pivot lugs in said hearings intermediate oi their ends, arranged for contact with said rods, 'to permit free oscillatory movement of said bearings substantially as set forth.

5. In an electric arc lam the combination with a stationary tubluar collumn; of a rod mounted to reciprocate in said column;

a lever pi'votally connected with said rod and comprising means to engage a carbon; a stationary abutment, in said column, being the edge of a recess in said column; and an abutment carried by said rod, arran' ed to liniit the movement of said lever, su stantially as set forth.

6. In an electric arc lainp, the combination with a stationary tubular column; of a rod mounted to reciprocate in said column;

a lever pivotally connected with said rod and comprising means to engage a carbon; a stationary abutment in'sa d column; a

projection on said lever arranged to contact with said abutment and tilt said lever; and, means connected with said rod, arranged to adjustably vary the extent of the tilting movement'of said lever with respect to said rod, substantially as set forth.

In testimony whereof, I have hereunto si 'ned my name at Philadelphia, Pennsfivania, this 2nd day of April, 1907.

THOMAS SPENCER.

Witnesses: GILBERT H. RETTEN,

WILMER M. STATES. 

